JPH07190262A - Pipe joint - Google Patents

Abstract

PURPOSE:To obtain a pipe joint which enables rapid connection which is hardly disconnected, bringing about a low cost and satisfactory workability, suitable for a winding-down pipe for a sprinkler arranged mainly in building. CONSTITUTION:A divided ring 10 is pressed to be in closed contact with a circular groove (B)9 formed on an outer peripheral surface of a male side cylindrical body 2. The male side cylindrical body 2 is inserted to the bottom of a reception port 3 of a female side cylindrical body 1. The divided ring 10 is elastically reset and fitted in a circular groove 4 formed on an inner peripheral surface of the female side cylindrical body 1. When the make side cylindrical body 2 is pulled outside, the divided ring 10 is sandwiched between the circular groove 4 and a stepped portion 8. A pipe joint structure of rapid connection in which sealing is carried out by a seal ring 6 is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for rapidly connecting a female-side tubular body and a male-side tubular body, and more specifically, it is mainly used for a sprinkler installed in a building or the like. The present invention relates to a pipe joint that is suitable for connection of a lowering pipe and is relatively rotatable.

[0002]

2. Description of the Related Art Conventionally, a variety of unwinding pipes for sprinklers installed in buildings and the like have been put on the market and various pipe joint structures for connecting the pipes have been adopted. An example is disclosed in Japanese Utility Model Laid-Open No. 5-1886.

The pipe joint structure disclosed in the above publication is such that the end portion of the curved pipe portion in one direction is relatively rotatably inserted into the end portion of the curved pipe portion on the other side, and the curved pipe is inserted in one direction. An annular recess is provided at the end of this portion, and an annular elastic retaining member is arranged in engagement with this annular groove, and an annular elastic packing is formed between the end of the curved pipe portion on the other side. It is installed in the.

[0004]

However, the conventional pipe joint structure described above has the following problems. That is, a diameter expansion process is required to interpose an annular elastic packing at the end of the curved pipe portion on the other side, resulting in high cost. or,
There is a possibility that it will come out if the bent tube on one side to be inserted is pulled strongly. Further, such a pipe joint structure has a problem in strength when it is made of plastic and is usually made of metal, so that it is heavy and difficult to work at the time of piping construction.

The present invention has been made in view of the problems of the prior art as described above, and an object thereof is that the structure is simple, the cost is low, the workability is good, and the pipe joint portion does not come off. It is to provide a pipe joint that can be rapidly connected.

[0006]

The structure of the present invention for solving the above problems will be described with reference to FIGS. That is, according to the configuration of the present invention, in the pipe joint in which the male-side tubular body 2 is inserted into the female-side tubular body 1 and both are rapidly connected, the annular groove 4 is formed on the inner peripheral surface of the female-side tubular body 1. On the other hand, on the outer peripheral surface of the end of the male-side tubular body 2, an annular groove (A) 5 in which a seal ring 6 is mounted, a stepped portion 8 which is notched shallower than the annular groove (A) 5, and An annular groove (B) 9 which is adjacent to and deeper than the step portion 8 is provided, and the annular groove (B) 9 has an inner diameter of the annular groove 4 provided in the female tubular body 1 and Split ring 10 having substantially the same outer diameter
Is characterized by being loosely fitted.

Each cylindrical body in the present invention may be a straight pipe, a curved pipe or a branch pipe. Further, the material thereof may be either metal or plastic, but preferably C-
Thermoplastics such as PVC, PVC, PVDF and PP are preferable.

[0008]

Operation: The split ring 10 is brought into close contact with the annular groove (B) 9 provided on the outer peripheral surface of the male-side tubular body 2 so that the male-side tubular body 2 reaches the back of the receptacle 3 of the female-side tubular body 1. insert. Then, the split ring 10 is elastically recovered and fitted into the annular groove 4 provided on the inner peripheral surface (receptacle inner peripheral surface) of the female-side tubular body 1 (state of FIG. 2). Then, when the male-side tubular body 2 is pulled outward, the split ring 10 is sandwiched between the annular groove 4 and the step portion 8 provided on the outer peripheral surface of the male-side tubular body 2 to form a pipe joint. (State of FIG. 1).

In the above structure, the male-side tubular body 2 and the female-side tubular body 1 are rotatable relative to each other, and the fluid seal between them is mounted in the annular groove (A) 5 of the male-side tubular body 2. It is secured by the sealing ring 6 that is installed. Further, when the male side tubular body 2 is inserted into the female side tubular body 1 to form a pipe joint, the male side tubular body 2 engages the split ring 10 with the flange portion 7, and therefore the female side tubular body 2 is engaged. It cannot be removed from 1.

[0010]

EXAMPLES The present invention will be described in more detail below with reference to FIGS. 1 to 3 showing the examples, but it goes without saying that the present invention is not limited to these examples.

FIG. 1 is a vertical sectional view showing a pipe joint made of chlorinated vinyl chloride resin. Further, FIG. 3 is an exploded perspective view thereof. In the figure, reference numeral 1 is a female-side tubular body having a diameter-increasing receiving port 3 inside. An annular groove 4 is formed at the outer end of the inner peripheral surface (receptacle inner peripheral surface) of the female-side tubular body 1.

Reference numeral 2 is a male-side tubular body, and an annular groove (A) 5 is provided on the outer peripheral surface of the end portion thereof, and a seal ring 6 is fitted therein. A flange portion 7, a step portion 8 that is cut out shallower than the annular groove (A) 5, and an annular groove (B) 9 that is deeper than the step portion 8 are provided on the outer peripheral surface of the annular groove (A) 5 continuously. Has been. Before forming the pipe joint, 10 is the annular groove (B).
9 is a split ring having elastic recovery force loosely fitted around 9.

At least the width and depth of the annular groove (B) 9 must be matched with the width and height of the split ring 10. The split ring 10 has an outer diameter that is substantially the same as the inner diameter of the bottom portion of the annular groove 4 provided in the female-side tubular body 1, and the outer side of the stepped portion 8 of the male-side tubular body 2. The annular groove (B) 9 is formed to have an inner diameter substantially equal to the diameter.
In addition, it is necessary to make a notch so as to have a circumferential dimension that allows close contact over the entire circumference (see FIG. 3).

In this embodiment, the seal ring 6 of the male side tubular body 2 and the annular groove (A) 5 into which the seal ring 6 is fitted are the step portion 8, the annular groove (B) 9 and the female side tubular body. Although it is located in front of the first annular groove 4, this positional relationship may be reversed (see FIG. 4).

The operation of this embodiment will be described below.
The split ring 10 is held in close contact with the annular groove (B) 9 of the male-side tubular body 2 by hand or the like, and the male-side tubular body 2 is inserted into the receptacle 3 of the female-side tubular body 1 to the back. Then, the split ring 10 is elastically recovered and fitted into the annular groove 4 provided on the inner peripheral surface of the receiving opening of the female tubular body 1. At this stage, the male side tubular body 2 has an annular groove (B).
9 are inserted into the female side tubular body 1 (state of FIG. 2).

Then, when the male-side tubular body 2 is pulled out, the split ring 10 is provided with the annular groove 4 and the step portion 8 of the male-side tubular body 2.
The pipe joint is sandwiched between and (the state of FIG. 1).
In order to obtain the above operation, the axial depth of the inner surface receiving opening 3 of the female-side tubular body 1 is at least from the end surface of the male-side tubular body 2 to the annular groove (B) 9. It is necessary to set the length to be longer than the length by the width of the annular groove (B) 9.

In the above structure, the fluid seal between the female-side tubular body 1 and the male-side tubular body 2 is secured by the seal ring 6, and the male-side tubular body 2 has the split ring 10 and the collar portion 7. Because of the engagement, it cannot be pulled out from the female-side tubular body 1. FIG. 5 is a vertical cross-sectional view of a downcomer pipe for a sprinkler using the pipe joint of this embodiment. Since the female-side tubular body and the male-side tubular body are rotatable relative to each other, the unwinding tube can be extended in all directions.

[0018]

When the pipe joint according to the present invention described above is used, the following effects can be obtained. 1. Since it is a pipe joint with a simple structure and quick connection, it is low in cost and excellent in workability and workability. In particular, if it is made of plastic, it can be integrally molded, so that the weight is reduced and workability and workability are further improved. 2. Since the female-side tubular body and the male-side tubular body can rotate relative to each other, it can be extended in any direction and anywhere if it is used as a lowering pipe of a sprinkler for fire extinguishing equipment installed in building construction etc. Excellent benefits are obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a pipe joint according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a state immediately before reaching the state of FIG.

3 is an exploded perspective view of the pipe joint shown in FIG. 1. FIG.

FIG. 4 is a vertical sectional view showing another embodiment of the present invention.

5 is a longitudinal sectional view of a main part of a downcomer pipe for a sprinkler using the pipe joint of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Female side cylindrical body 2 ... Male side cylindrical body 3 ... Receptacle 4 ... Annular groove 5 ... Annular groove (A) 6 ... Seal ring 7 ... Tsuba Part 8 ... Stepped part 9 ... Annular groove (B) 10 ... Split ring

Claims (1)

[Claims] 1. A pipe joint for inserting a male tubular body into a female tubular body and rapidly connecting them, wherein an annular groove is provided on the inner peripheral surface of the female tubular body, while On the outer peripheral surface of the end portion of the side tubular body, an annular groove (A) in which a seal ring is mounted, a step portion which is cut out shallower than the annular groove (A), and an annular groove which is adjacent to and deeper than the step portion ( B) is provided, and a split ring having an outer diameter substantially the same as the inner diameter of the annular groove provided in the female cylindrical body is loosely fitted in the annular groove (B). Pipe fittings characterized by being.